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1

Antibiotic susceptibility of Lactococcus isolated from Turkish raw milk cheeses

100%
Cetinkaya F., Coplu N., Simsek H., Elal Mus T., Cibik R.
Medycyna Weterynaryjna
|
2012
|
tom 68
|
nr 01
Lactococcus lactis strains isolated from traditionally produced Turkish White Pickled (22 strains) and Kashar cheeses (18 strains) were examined for susceptibility to a range of antibiotics, including ampicillin, amoxicillin/ clavulanic acid, vancomycin, oxacillin, penicillin G, cefotaxime, ciprofloxacin, gentamicin, streptomycin, tetracycline, erythromycin, trimethoprim, chloramphenicol, clindamycin and rifampicin, by the disc diffusion method. Susceptibility to ampicillin, amoxicillin-clavulanic acid, vancomycin and chloramphenicol, and resistance to oxacillin antibiotics were observed in all strains tested. The susceptibility to the other antibiotics was variable and strain-dependent. Only one strain exhibited resistance to erythromycin. All strains were resistant to more than one of the antibiotics tested, and the greatest number of strains were resistant to oxacillin, ceftazidime, streptomycin and clindamycin. A multiple antibiotic resistance profile revealed that most of the strains (92.5%) were resistant to three to seven antibiotics, whereas one strain demonstrated resistance to two antibiotics. The highest resistance was found in two strains isolated from White Pickled cheese, of which one was resistant to eight and the other to nine antibiotics. Our findings reveal a high level of antibiotic resistance among the strains of L. lactis and emphasize the need for prudent use of antibiotics.
2

Autolysis of Listeria monocytogenes strains isolated from food and clinical specimens

100%
Cibik R., Cetinkaya F., Gunes N., Ozakin C., Soyutemiz G. E.
Medycyna Weterynaryjna
|
2006
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tom 62
|
nr 11
1242-1244
Autolysis of Listeria monocytogenes strains isolated from clinical and food specimens were tested under starvation conditions. Late exponential phase harvested bacterial cells were transferred in potassium phosphate buffer (100 mM, pH 7) and incubated at 37°C to induce lysis. At the end of the 48 h incubation period a heterogeneous autolysis profile was observed among the tested strains. All the clinical strains exhibited high autolysis i.e. above 75%. Meanwhile, the extent of food isolates was not as high as the clinical ones but demonstrated a great variability - ranging between 22 to 88%. An increase in the amount of intracellular markers upon lysis was also measured in the higher autolytic clinical strain - UVF172, compared to low autolytic food strain - UVF114. The results obtained from the study provided evidence that autolysis in L. monocytogenes is strain dependent and revealed that tested clinical isolates had a higher level of autolysis than food isolates.
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